Built upon that same interface is the cluster module, which allows you to share sockets between processes to enable load balancing over your cores.Īlso Available: Download Node.js for Windowsįreeware programs can be downloaded used free of charge and without any time limitations. Child processes can be spawned by using child_process.fork() API, and are designed to be easy to communicate with.
Just because Nodejs is designed without threads, doesn't mean you cannot take advantage of multiple cores in your environment. This makes Node js well suited for the foundation of a web library or framework. HTTP is a first-class citizen in Nodejs, designed with streaming and low latency in mind. This behavior is like browser JavaScript - the event loop is hidden from the user. The tool exits the event loop when there are no more callbacks to perform. It simply enters the event loop after executing the input script. In Node js, there is no such start-the-event-loop call. Typically behavior is defined through callbacks at the beginning of a script and at the end starts a server through a blocking call like EventMachine::run().
In other systems, there is always a blocking call to start the event-loop. It presents an event loop as a runtime construct instead of a library. Node.js is similar in design to and influenced by, systems like Ruby's Event Machine or Python's Twisted. Because nothing blocks, scalable systems are very reasonable to develop in Node. Almost no function in the app directly performs I/O, so the process never blocks. Furthermore, users of Nodejs are free from worries of dead-locking the process, since there are no locks. Thread-based networking is relatively inefficient and very difficult to use. This is in contrast to today's more common concurrency model where OS threads are employed. Upon each connection, the callback is fired, but if there is no work to be done, Node for macOS will sleep. In the following "hello world" example, many connections can be handled concurrently. As an asynchronous event-driven JavaScript runtime, Node for Mac is designed to build scalable network applications.
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